src/richtext/richtextctrl.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/richtext/richeditctrl.cpp
   3 // Purpose:     A rich edit control
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     2005-09-30
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // For compilers that support precompilation, includes "wx.h".
  13 #include "wx/wxprec.h"
  14
  15 #ifdef __BORLANDC__
  16     #pragma hdrstop
  17 #endif
  18
  19 #if wxUSE_RICHTEXT
  20
  21 #include "wx/richtext/richtextctrl.h"
  22 #include "wx/richtext/richtextstyles.h"
  23
  24 #ifndef WX_PRECOMP
  25     #include "wx/wx.h"
  26     #include "wx/settings.h"
  27 #endif
  28
  29 #include "wx/textfile.h"
  30 #include "wx/ffile.h"
  31 #include "wx/filename.h"
  32 #include "wx/dcbuffer.h"
  33 #include "wx/arrimpl.cpp"
  34
  35 // DLL options compatibility check:
  36 #include "wx/app.h"
  37 WX_CHECK_BUILD_OPTIONS("wxRichTextCtrl")
  38
  39 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_ITEM_SELECTED)
  40 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_ITEM_DESELECTED)
  41 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_LEFT_CLICK)
  42 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_MIDDLE_CLICK)
  43 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_RIGHT_CLICK)
  44 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_LEFT_DCLICK)
  45 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_RETURN)
  46
  47 IMPLEMENT_CLASS( wxRichTextCtrl, wxControl )
  48
  49 IMPLEMENT_CLASS( wxRichTextEvent, wxNotifyEvent )
  50
  51 BEGIN_EVENT_TABLE( wxRichTextCtrl, wxControl )
  52     EVT_PAINT(wxRichTextCtrl::OnPaint)
  53     EVT_ERASE_BACKGROUND(wxRichTextCtrl::OnEraseBackground)
  54     EVT_IDLE(wxRichTextCtrl::OnIdle)
  55     EVT_SCROLLWIN(wxRichTextCtrl::OnScroll)
  56     EVT_LEFT_DOWN(wxRichTextCtrl::OnLeftClick)
  57     EVT_MOTION(wxRichTextCtrl::OnMoveMouse)
  58     EVT_LEFT_UP(wxRichTextCtrl::OnLeftUp)
  59     EVT_RIGHT_DOWN(wxRichTextCtrl::OnRightClick)
  60     EVT_MIDDLE_DOWN(wxRichTextCtrl::OnMiddleClick)
  61     EVT_LEFT_DCLICK(wxRichTextCtrl::OnLeftDClick)
  62     EVT_CHAR(wxRichTextCtrl::OnChar)
  63     EVT_SIZE(wxRichTextCtrl::OnSize)
  64     EVT_SET_FOCUS(wxRichTextCtrl::OnSetFocus)
  65     EVT_KILL_FOCUS(wxRichTextCtrl::OnKillFocus)
  66     EVT_CONTEXT_MENU(wxRichTextCtrl::OnContextMenu)
  67
  68     EVT_MENU(wxID_UNDO, wxRichTextCtrl::OnUndo)
  69     EVT_UPDATE_UI(wxID_UNDO, wxRichTextCtrl::OnUpdateUndo)
  70
  71     EVT_MENU(wxID_REDO, wxRichTextCtrl::OnRedo)
  72     EVT_UPDATE_UI(wxID_REDO, wxRichTextCtrl::OnUpdateRedo)
  73
  74     EVT_MENU(wxID_COPY, wxRichTextCtrl::OnCopy)
  75     EVT_UPDATE_UI(wxID_COPY, wxRichTextCtrl::OnUpdateCopy)
  76
  77     EVT_MENU(wxID_PASTE, wxRichTextCtrl::OnPaste)
  78     EVT_UPDATE_UI(wxID_PASTE, wxRichTextCtrl::OnUpdatePaste)
  79
  80     EVT_MENU(wxID_CUT, wxRichTextCtrl::OnCut)
  81     EVT_UPDATE_UI(wxID_CUT, wxRichTextCtrl::OnUpdateCut)
  82
  83     EVT_MENU(wxID_CLEAR, wxRichTextCtrl::OnClear)
  84     EVT_UPDATE_UI(wxID_CLEAR, wxRichTextCtrl::OnUpdateClear)
  85
  86     EVT_MENU(wxID_SELECTALL, wxRichTextCtrl::OnSelectAll)
  87     EVT_UPDATE_UI(wxID_SELECTALL, wxRichTextCtrl::OnUpdateSelectAll)
  88 END_EVENT_TABLE()
  89
  90 /*!
  91  * wxRichTextCtrl
  92  */
  93
  94 wxRichTextCtrl::wxRichTextCtrl()
  95               : wxScrollHelper(this)
  96 {
  97     Init();
  98 }
  99
 100 wxRichTextCtrl::wxRichTextCtrl(wxWindow* parent,
 101                                wxWindowID id,
 102                                const wxString& value,
 103                                const wxPoint& pos,
 104                                const wxSize& size,
 105                                long style)
 106               : wxScrollHelper(this)
 107 {
 108     Init();
 109     Create(parent, id, value, pos, size, style);
 110 }
 111
 112 /// Creation
 113 bool wxRichTextCtrl::Create( wxWindow* parent, wxWindowID id, const wxString& value, const wxPoint& pos, const wxSize& size, long style)
 114 {
 115     if (!wxTextCtrlBase::Create(parent, id, pos, size,
 116                                 style|wxFULL_REPAINT_ON_RESIZE))
 117         return false;
 118
 119     if (!GetFont().Ok())
 120     {
 121         SetFont(wxSystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT));
 122     }
 123
 124     GetBuffer().SetRichTextCtrl(this);
 125
 126     wxTextAttrEx attributes;
 127     attributes.SetFont(GetFont());
 128     attributes.SetTextColour(*wxBLACK);
 129     attributes.SetBackgroundColour(*wxWHITE);
 130     attributes.SetAlignment(wxTEXT_ALIGNMENT_LEFT);
 131     attributes.SetLineSpacing(10);
 132     attributes.SetParagraphSpacingAfter(10);
 133     attributes.SetParagraphSpacingBefore(0);
 134     attributes.SetFlags(wxTEXT_ATTR_ALL);
 135     SetBasicStyle(attributes);
 136
 137     // The default attributes will be merged with base attributes, so
 138     // can be empty to begin with
 139     wxTextAttrEx defaultAttributes;
 140     SetDefaultStyle(defaultAttributes);
 141
 142     SetBackgroundColour(*wxWHITE);
 143     SetBackgroundStyle(wxBG_STYLE_CUSTOM);
 144
 145     // Tell the sizers to use the given or best size
 146     SetBestFittingSize(size);
 147
 148 #if wxRICHTEXT_BUFFERED_PAINTING
 149     // Create a buffer
 150     RecreateBuffer(size);
 151 #endif
 152
 153     SetCursor(wxCursor(wxCURSOR_IBEAM));
 154
 155     if (!value.IsEmpty())
 156         SetValue(value);
 157
 158     return true;
 159 }
 160
 161 wxRichTextCtrl::~wxRichTextCtrl()
 162 {
 163     delete m_contextMenu;
 164 }
 165
 166 /// Member initialisation
 167 void wxRichTextCtrl::Init()
 168 {
 169     m_freezeCount = 0;
 170     m_contextMenu = NULL;
 171     m_caret = NULL;
 172     m_caretPosition = -1;
 173     m_selectionRange.SetRange(-2, -2);
 174     m_selectionAnchor = -2;
 175     m_editable = true;
 176     m_caretAtLineStart = false;
 177     m_dragging = false;
 178     m_fullLayoutRequired = false;
 179     m_fullLayoutTime = 0;
 180     m_fullLayoutSavedPosition = 0;
 181     m_delayedLayoutThreshold = wxRICHTEXT_DEFAULT_DELAYED_LAYOUT_THRESHOLD;
 182     m_caretPositionForDefaultStyle = -2;
 183 }
 184
 185 /// Call Freeze to prevent refresh
 186 void wxRichTextCtrl::Freeze()
 187 {
 188     m_freezeCount ++;
 189 }
 190
 191 /// Call Thaw to refresh
 192 void wxRichTextCtrl::Thaw()
 193 {
 194     m_freezeCount --;
 195
 196     if (m_freezeCount == 0)
 197     {
 198         SetupScrollbars();
 199         Refresh(false);
 200     }
 201 }
 202
 203 /// Clear all text
 204 void wxRichTextCtrl::Clear()
 205 {
 206     m_buffer.Reset();
 207     m_buffer.SetDirty(true);
 208     m_caretPosition = -1;
 209     m_caretPositionForDefaultStyle = -2;
 210     m_caretAtLineStart = false;
 211     m_selectionRange.SetRange(-2, -2);
 212
 213     SetScrollbars(0, 0, 0, 0, 0, 0);
 214
 215     if (m_freezeCount == 0)
 216     {
 217         SetupScrollbars();
 218         Refresh(false);
 219     }
 220     SendTextUpdatedEvent();
 221 }
 222
 223 /// Painting
 224 void wxRichTextCtrl::OnPaint(wxPaintEvent& WXUNUSED(event))
 225 {
 226     if (GetCaret())
 227         GetCaret()->Hide();
 228
 229     {
 230 #if wxRICHTEXT_BUFFERED_PAINTING
 231         wxBufferedPaintDC dc(this, m_bufferBitmap);
 232 #else
 233         wxPaintDC dc(this);
 234 #endif
 235         PrepareDC(dc);
 236
 237         if (m_freezeCount > 0)
 238             return;
 239
 240         dc.SetFont(GetFont());
 241
 242         // Paint the background
 243         PaintBackground(dc);
 244
 245         wxRect drawingArea(GetLogicalPoint(wxPoint(0, 0)), GetClientSize());
 246         wxRect availableSpace(GetClientSize());
 247         if (GetBuffer().GetDirty())
 248         {
 249             GetBuffer().Layout(dc, availableSpace, wxRICHTEXT_FIXED_WIDTH|wxRICHTEXT_VARIABLE_HEIGHT);
 250             GetBuffer().SetDirty(false);
 251             SetupScrollbars();
 252         }
 253
 254         GetBuffer().Draw(dc, GetBuffer().GetRange(), GetInternalSelectionRange(), drawingArea, 0 /* descent */, 0 /* flags */);
 255     }
 256
 257     if (GetCaret())
 258         GetCaret()->Show();
 259
 260     PositionCaret();
 261 }
 262
 263 // Empty implementation, to prevent flicker
 264 void wxRichTextCtrl::OnEraseBackground(wxEraseEvent& WXUNUSED(event))
 265 {
 266 }
 267
 268 void wxRichTextCtrl::OnSetFocus(wxFocusEvent& WXUNUSED(event))
 269 {
 270     wxCaret* caret = new wxCaret(this, wxRICHTEXT_DEFAULT_CARET_WIDTH, 16);
 271     SetCaret(caret);
 272     caret->Show();
 273     PositionCaret();
 274
 275     if (!IsFrozen())
 276         Refresh(false);
 277 }
 278
 279 void wxRichTextCtrl::OnKillFocus(wxFocusEvent& WXUNUSED(event))
 280 {
 281     SetCaret(NULL);
 282
 283     if (!IsFrozen())
 284         Refresh(false);
 285 }
 286
 287 /// Left-click
 288 void wxRichTextCtrl::OnLeftClick(wxMouseEvent& event)
 289 {
 290     SetFocus();
 291
 292     wxClientDC dc(this);
 293     PrepareDC(dc);
 294     dc.SetFont(GetFont());
 295
 296     long position = 0;
 297     int hit = GetBuffer().HitTest(dc, event.GetLogicalPosition(dc), position);
 298
 299     if (hit != wxRICHTEXT_HITTEST_NONE)
 300     {
 301         m_dragStart = event.GetLogicalPosition(dc);
 302         m_dragging = true;
 303         CaptureMouse();
 304
 305         SelectNone();
 306
 307         bool caretAtLineStart = false;
 308
 309         if (hit & wxRICHTEXT_HITTEST_BEFORE)
 310         {
 311             // If we're at the start of a line (but not first in para)
 312             // then we should keep the caret showing at the start of the line
 313             // by showing the m_caretAtLineStart flag.
 314             wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(position);
 315             wxRichTextLine* line = GetBuffer().GetLineAtPosition(position);
 316
 317             if (line && para && line->GetAbsoluteRange().GetStart() == position && para->GetRange().GetStart() != position)
 318                 caretAtLineStart = true;
 319             position --;
 320         }
 321
 322         MoveCaret(position, caretAtLineStart);
 323         SetDefaultStyleToCursorStyle();
 324     }
 325
 326     event.Skip();
 327 }
 328
 329 /// Left-up
 330 void wxRichTextCtrl::OnLeftUp(wxMouseEvent& WXUNUSED(event))
 331 {
 332     if (m_dragging)
 333     {
 334         m_dragging = false;
 335         if (GetCapture() == this)
 336             ReleaseMouse();
 337     }
 338 }
 339
 340 /// Left-click
 341 void wxRichTextCtrl::OnMoveMouse(wxMouseEvent& event)
 342 {
 343     if (!event.Dragging())
 344     {
 345         event.Skip();
 346         return;
 347     }
 348
 349     wxClientDC dc(this);
 350     PrepareDC(dc);
 351     dc.SetFont(GetFont());
 352
 353     long position = 0;
 354     wxPoint logicalPt = event.GetLogicalPosition(dc);
 355     int hit = GetBuffer().HitTest(dc, logicalPt, position);
 356
 357     if (m_dragging && hit != wxRICHTEXT_HITTEST_NONE)
 358     {
 359         // TODO: test closeness
 360
 361         bool caretAtLineStart = false;
 362
 363         if (hit & wxRICHTEXT_HITTEST_BEFORE)
 364         {
 365             // If we're at the start of a line (but not first in para)
 366             // then we should keep the caret showing at the start of the line
 367             // by showing the m_caretAtLineStart flag.
 368             wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(position);
 369             wxRichTextLine* line = GetBuffer().GetLineAtPosition(position);
 370
 371             if (line && para && line->GetAbsoluteRange().GetStart() == position && para->GetRange().GetStart() != position)
 372                 caretAtLineStart = true;
 373             position --;
 374         }
 375
 376         if (m_caretPosition != position)
 377         {
 378             bool extendSel = ExtendSelection(m_caretPosition, position, wxRICHTEXT_SHIFT_DOWN);
 379
 380             MoveCaret(position, caretAtLineStart);
 381             SetDefaultStyleToCursorStyle();
 382
 383             if (extendSel)
 384                 Refresh(false);
 385         }
 386     }
 387 }
 388
 389 /// Right-click
 390 void wxRichTextCtrl::OnRightClick(wxMouseEvent& event)
 391 {
 392     SetFocus();
 393     event.Skip();
 394 }
 395
 396 /// Left-double-click
 397 void wxRichTextCtrl::OnLeftDClick(wxMouseEvent& event)
 398 {
 399     SelectWord(GetCaretPosition()+1);
 400     event.Skip();
 401 }
 402
 403 /// Middle-click
 404 void wxRichTextCtrl::OnMiddleClick(wxMouseEvent& event)
 405 {
 406     event.Skip();
 407 }
 408
 409 /// Key press
 410 void wxRichTextCtrl::OnChar(wxKeyEvent& event)
 411 {
 412     int flags = 0;
 413     if (event.CmdDown())
 414         flags |= wxRICHTEXT_CTRL_DOWN;
 415     if (event.ShiftDown())
 416         flags |= wxRICHTEXT_SHIFT_DOWN;
 417     if (event.AltDown())
 418         flags |= wxRICHTEXT_ALT_DOWN;
 419
 420     if (event.GetKeyCode() == WXK_LEFT ||
 421         event.GetKeyCode() == WXK_RIGHT ||
 422         event.GetKeyCode() == WXK_UP ||
 423         event.GetKeyCode() == WXK_DOWN ||
 424         event.GetKeyCode() == WXK_HOME ||
 425         event.GetKeyCode() == WXK_PAGEUP ||
 426         event.GetKeyCode() == WXK_PAGEDOWN ||
 427         event.GetKeyCode() == WXK_END ||
 428
 429         event.GetKeyCode() == WXK_NUMPAD_LEFT ||
 430         event.GetKeyCode() == WXK_NUMPAD_RIGHT ||
 431         event.GetKeyCode() == WXK_NUMPAD_UP ||
 432         event.GetKeyCode() == WXK_NUMPAD_DOWN ||
 433         event.GetKeyCode() == WXK_NUMPAD_HOME ||
 434         event.GetKeyCode() == WXK_NUMPAD_PAGEUP ||
 435         event.GetKeyCode() == WXK_NUMPAD_PAGEDOWN ||
 436         event.GetKeyCode() == WXK_NUMPAD_END)
 437     {
 438         KeyboardNavigate(event.GetKeyCode(), flags);
 439         return;
 440     }
 441
 442     // all the other keys modify the controls contents which shouldn't be
 443     // possible if we're read-only
 444     if ( !IsEditable() )
 445     {
 446         event.Skip();
 447         return;
 448     }
 449
 450     if (event.GetKeyCode() == WXK_RETURN)
 451     {
 452         BeginBatchUndo(_("Insert Text"));
 453
 454         long newPos = m_caretPosition;
 455
 456         DeleteSelectedContent(& newPos);
 457
 458         GetBuffer().InsertNewlineWithUndo(newPos+1, this, wxRICHTEXT_INSERT_WITH_PREVIOUS_PARAGRAPH_STYLE);
 459
 460         wxRichTextEvent cmdEvent(
 461             wxEVT_COMMAND_RICHTEXT_RETURN,
 462             GetId());
 463         cmdEvent.SetEventObject(this);
 464         cmdEvent.SetFlags(flags);
 465         GetEventHandler()->ProcessEvent(cmdEvent);
 466
 467         EndBatchUndo();
 468         SetDefaultStyleToCursorStyle();
 469
 470         ScrollIntoView(m_caretPosition, WXK_RIGHT);
 471     }
 472     else if (event.GetKeyCode() == WXK_BACK)
 473     {
 474         BeginBatchUndo(_("Delete Text"));
 475
 476         // Submit range in character positions, which are greater than caret positions,
 477         // so subtract 1 for deleted character and add 1 for conversion to character position.
 478         if (m_caretPosition > -1 && !HasSelection())
 479         {
 480             GetBuffer().DeleteRangeWithUndo(wxRichTextRange(m_caretPosition, m_caretPosition),
 481                 m_caretPosition,   // Current caret position
 482                 m_caretPosition-1, // New caret position
 483                 this);
 484         }
 485         else
 486             DeleteSelectedContent();
 487
 488         EndBatchUndo();
 489
 490         // Shouldn't this be in Do()?
 491         if (GetLastPosition() == -1)
 492         {
 493             GetBuffer().Reset();
 494
 495             m_caretPosition = -1;
 496             PositionCaret();
 497             SetDefaultStyleToCursorStyle();
 498         }
 499
 500         ScrollIntoView(m_caretPosition, WXK_LEFT);
 501     }
 502     else if (event.GetKeyCode() == WXK_DELETE)
 503     {
 504         BeginBatchUndo(_("Delete Text"));
 505
 506         // Submit range in character positions, which are greater than caret positions,
 507         if (m_caretPosition < GetBuffer().GetRange().GetEnd()+1 && !HasSelection())
 508         {
 509             GetBuffer().DeleteRangeWithUndo(wxRichTextRange(m_caretPosition+1, m_caretPosition+1),
 510                 m_caretPosition,   // Current caret position
 511                 m_caretPosition+1, // New caret position
 512                 this);
 513         }
 514         else
 515             DeleteSelectedContent();
 516
 517         EndBatchUndo();
 518
 519         // Shouldn't this be in Do()?
 520         if (GetLastPosition() == -1)
 521         {
 522             GetBuffer().Reset();
 523
 524             m_caretPosition = -1;
 525             PositionCaret();
 526             SetDefaultStyleToCursorStyle();
 527         }
 528     }
 529     else
 530     {
 531         long keycode = event.GetKeyCode();
 532         switch ( keycode )
 533         {
 534             case WXK_ESCAPE:
 535             // case WXK_SPACE:
 536             case WXK_DELETE:
 537             case WXK_START:
 538             case WXK_LBUTTON:
 539             case WXK_RBUTTON:
 540             case WXK_CANCEL:
 541             case WXK_MBUTTON:
 542             case WXK_CLEAR:
 543             case WXK_SHIFT:
 544             case WXK_ALT:
 545             case WXK_CONTROL:
 546             case WXK_MENU:
 547             case WXK_PAUSE:
 548             case WXK_CAPITAL:
 549             case WXK_END:
 550             case WXK_HOME:
 551             case WXK_LEFT:
 552             case WXK_UP:
 553             case WXK_RIGHT:
 554             case WXK_DOWN:
 555             case WXK_SELECT:
 556             case WXK_PRINT:
 557             case WXK_EXECUTE:
 558             case WXK_SNAPSHOT:
 559             case WXK_INSERT:
 560             case WXK_HELP:
 561             case WXK_NUMPAD0:
 562             case WXK_NUMPAD1:
 563             case WXK_NUMPAD2:
 564             case WXK_NUMPAD3:
 565             case WXK_NUMPAD4:
 566             case WXK_NUMPAD5:
 567             case WXK_NUMPAD6:
 568             case WXK_NUMPAD7:
 569             case WXK_NUMPAD8:
 570             case WXK_NUMPAD9:
 571             case WXK_MULTIPLY:
 572             case WXK_ADD:
 573             case WXK_SEPARATOR:
 574             case WXK_SUBTRACT:
 575             case WXK_DECIMAL:
 576             case WXK_DIVIDE:
 577             case WXK_F1:
 578             case WXK_F2:
 579             case WXK_F3:
 580             case WXK_F4:
 581             case WXK_F5:
 582             case WXK_F6:
 583             case WXK_F7:
 584             case WXK_F8:
 585             case WXK_F9:
 586             case WXK_F10:
 587             case WXK_F11:
 588             case WXK_F12:
 589             case WXK_F13:
 590             case WXK_F14:
 591             case WXK_F15:
 592             case WXK_F16:
 593             case WXK_F17:
 594             case WXK_F18:
 595             case WXK_F19:
 596             case WXK_F20:
 597             case WXK_F21:
 598             case WXK_F22:
 599             case WXK_F23:
 600             case WXK_F24:
 601             case WXK_NUMLOCK:
 602             case WXK_SCROLL:
 603             case WXK_PAGEUP:
 604             case WXK_PAGEDOWN:
 605             case WXK_NUMPAD_SPACE:
 606             case WXK_NUMPAD_TAB:
 607             case WXK_NUMPAD_ENTER:
 608             case WXK_NUMPAD_F1:
 609             case WXK_NUMPAD_F2:
 610             case WXK_NUMPAD_F3:
 611             case WXK_NUMPAD_F4:
 612             case WXK_NUMPAD_HOME:
 613             case WXK_NUMPAD_LEFT:
 614             case WXK_NUMPAD_UP:
 615             case WXK_NUMPAD_RIGHT:
 616             case WXK_NUMPAD_DOWN:
 617             case WXK_NUMPAD_PAGEUP:
 618             case WXK_NUMPAD_PAGEDOWN:
 619             case WXK_NUMPAD_END:
 620             case WXK_NUMPAD_BEGIN:
 621             case WXK_NUMPAD_INSERT:
 622             case WXK_NUMPAD_DELETE:
 623             case WXK_NUMPAD_EQUAL:
 624             case WXK_NUMPAD_MULTIPLY:
 625             case WXK_NUMPAD_ADD:
 626             case WXK_NUMPAD_SEPARATOR:
 627             case WXK_NUMPAD_SUBTRACT:
 628             case WXK_NUMPAD_DECIMAL:
 629             {
 630                 event.Skip();
 631                 return;
 632             }
 633
 634             default:
 635             {
 636                 if (event.CmdDown() || event.AltDown())
 637                 {
 638                     event.Skip();
 639                     return;
 640                 }
 641
 642                 BeginBatchUndo(_("Insert Text"));
 643
 644                 long newPos = m_caretPosition;
 645                 DeleteSelectedContent(& newPos);
 646
 647                 wxString str = (wxChar) event.GetKeyCode();
 648                 GetBuffer().InsertTextWithUndo(newPos+1, str, this, wxRICHTEXT_INSERT_WITH_PREVIOUS_PARAGRAPH_STYLE);
 649
 650                 EndBatchUndo();
 651
 652                 SetDefaultStyleToCursorStyle();
 653                 ScrollIntoView(m_caretPosition, WXK_RIGHT);
 654             }
 655         }
 656     }
 657 }
 658
 659 /// Delete content if there is a selection, e.g. when pressing a key.
 660 bool wxRichTextCtrl::DeleteSelectedContent(long* newPos)
 661 {
 662     if (HasSelection())
 663     {
 664         long pos = m_selectionRange.GetStart();
 665         GetBuffer().DeleteRangeWithUndo(m_selectionRange,
 666             m_caretPosition,       // Current caret position
 667             pos,    // New caret position
 668             this);
 669         m_selectionRange.SetRange(-2, -2);
 670
 671         if (newPos)
 672             *newPos = pos-1;
 673         return true;
 674     }
 675     else
 676         return false;
 677 }
 678
 679 /// Keyboard navigation
 680
 681 /*
 682
 683 Left:       left one character
 684 Right:      right one character
 685 Up:         up one line
 686 Down:       down one line
 687 Ctrl-Left:  left one word
 688 Ctrl-Right: right one word
 689 Ctrl-Up:    previous paragraph start
 690 Ctrl-Down:  next start of paragraph
 691 Home:       start of line
 692 End:        end of line
 693 Ctrl-Home:  start of document
 694 Ctrl-End:   end of document
 695 Page-Up:    Up a screen
 696 Page-Down:  Down a screen
 697
 698 Maybe:
 699
 700 Ctrl-Alt-PgUp: Start of window
 701 Ctrl-Alt-PgDn: End of window
 702 F8:         Start selection mode
 703 Esc:        End selection mode
 704
 705 Adding Shift does the above but starts/extends selection.
 706
 707
 708  */
 709
 710 bool wxRichTextCtrl::KeyboardNavigate(int keyCode, int flags)
 711 {
 712     bool success = false;
 713
 714     if (keyCode == WXK_RIGHT || keyCode == WXK_NUMPAD_RIGHT)
 715     {
 716         if (flags & wxRICHTEXT_CTRL_DOWN)
 717             success = WordRight(1, flags);
 718         else
 719             success = MoveRight(1, flags);
 720     }
 721     else if (keyCode == WXK_LEFT || keyCode == WXK_NUMPAD_LEFT)
 722     {
 723         if (flags & wxRICHTEXT_CTRL_DOWN)
 724             success = WordLeft(1, flags);
 725         else
 726             success = MoveLeft(1, flags);
 727     }
 728     else if (keyCode == WXK_UP || keyCode == WXK_NUMPAD_UP)
 729     {
 730         if (flags & wxRICHTEXT_CTRL_DOWN)
 731             success = MoveToParagraphStart(flags);
 732         else
 733             success = MoveUp(1, flags);
 734     }
 735     else if (keyCode == WXK_DOWN || keyCode == WXK_NUMPAD_DOWN)
 736     {
 737         if (flags & wxRICHTEXT_CTRL_DOWN)
 738             success = MoveToParagraphEnd(flags);
 739         else
 740             success = MoveDown(1, flags);
 741     }
 742     else if (keyCode == WXK_PAGEUP || keyCode == WXK_NUMPAD_PAGEUP)
 743     {
 744         success = PageUp(1, flags);
 745     }
 746     else if (keyCode == WXK_PAGEDOWN || keyCode == WXK_NUMPAD_PAGEDOWN)
 747     {
 748         success = PageDown(1, flags);
 749     }
 750     else if (keyCode == WXK_HOME || keyCode == WXK_NUMPAD_HOME)
 751     {
 752         if (flags & wxRICHTEXT_CTRL_DOWN)
 753             success = MoveHome(flags);
 754         else
 755             success = MoveToLineStart(flags);
 756     }
 757     else if (keyCode == WXK_END || keyCode == WXK_NUMPAD_END)
 758     {
 759         if (flags & wxRICHTEXT_CTRL_DOWN)
 760             success = MoveEnd(flags);
 761         else
 762             success = MoveToLineEnd(flags);
 763     }
 764
 765     if (success)
 766     {
 767         ScrollIntoView(m_caretPosition, keyCode);
 768         SetDefaultStyleToCursorStyle();
 769     }
 770
 771     return success;
 772 }
 773
 774 /// Extend the selection. Selections are in caret positions.
 775 bool wxRichTextCtrl::ExtendSelection(long oldPos, long newPos, int flags)
 776 {
 777     if (flags & wxRICHTEXT_SHIFT_DOWN)
 778     {
 779         // If not currently selecting, start selecting
 780         if (m_selectionRange.GetStart() == -2)
 781         {
 782             m_selectionAnchor = oldPos;
 783
 784             if (oldPos > newPos)
 785                 m_selectionRange.SetRange(newPos+1, oldPos);
 786             else
 787                 m_selectionRange.SetRange(oldPos+1, newPos);
 788         }
 789         else
 790         {
 791             // Always ensure that the selection range start is greater than
 792             // the end.
 793             if (newPos > m_selectionAnchor)
 794                 m_selectionRange.SetRange(m_selectionAnchor+1, newPos);
 795             else
 796                 m_selectionRange.SetRange(newPos+1, m_selectionAnchor);
 797         }
 798
 799         if (m_selectionRange.GetStart() > m_selectionRange.GetEnd())
 800         {
 801             wxLogDebug(wxT("Strange selection range"));
 802         }
 803
 804         return true;
 805     }
 806     else
 807         return false;
 808 }
 809
 810 /// Scroll into view, returning true if we scrolled.
 811 /// This takes a _caret_ position.
 812 bool wxRichTextCtrl::ScrollIntoView(long position, int keyCode)
 813 {
 814     wxRichTextLine* line = GetVisibleLineForCaretPosition(position);
 815
 816     if (!line)
 817         return false;
 818
 819     int ppuX, ppuY;
 820     GetScrollPixelsPerUnit(& ppuX, & ppuY);
 821
 822     int startXUnits, startYUnits;
 823     GetViewStart(& startXUnits, & startYUnits);
 824     int startY = startYUnits * ppuY;
 825
 826     int sx = 0, sy = 0;
 827     GetVirtualSize(& sx, & sy);
 828     int sxUnits = 0;
 829     int syUnits = 0;
 830     if (ppuY != 0)
 831         syUnits = sy/ppuY;
 832
 833     wxRect rect = line->GetRect();
 834
 835     bool scrolled = false;
 836
 837     wxSize clientSize = GetClientSize();
 838
 839     // Going down
 840     if (keyCode == WXK_DOWN || keyCode == WXK_NUMPAD_DOWN ||
 841         keyCode == WXK_RIGHT || keyCode == WXK_NUMPAD_DOWN ||
 842         keyCode == WXK_END || keyCode == WXK_NUMPAD_END ||
 843         keyCode == WXK_PAGEDOWN || keyCode == WXK_NUMPAD_PAGEDOWN)
 844     {
 845         if ((rect.y + rect.height) > (clientSize.y + startY))
 846         {
 847             // Make it scroll so this item is at the bottom
 848             // of the window
 849             int y = rect.y - (clientSize.y - rect.height);
 850             int yUnits = (int) (0.5 + ((float) y)/(float) ppuY);
 851
 852             // If we're still off the screen, scroll another line down
 853             if ((rect.y + rect.height) > (clientSize.y + (yUnits*ppuY)))
 854                 yUnits ++;
 855
 856             if (startYUnits != yUnits)
 857             {
 858                 SetScrollbars(ppuX, ppuY, sxUnits, syUnits, 0, yUnits);
 859                 scrolled = true;
 860             }
 861         }
 862         else if (rect.y < startY)
 863         {
 864             // Make it scroll so this item is at the top
 865             // of the window
 866             int y = rect.y ;
 867             int yUnits = (int) (0.5 + ((float) y)/(float) ppuY);
 868
 869             if (startYUnits != yUnits)
 870             {
 871                 SetScrollbars(ppuX, ppuY, sxUnits, syUnits, 0, yUnits);
 872                 scrolled = true;
 873             }
 874         }
 875     }
 876     // Going up
 877     else if (keyCode == WXK_UP  || keyCode == WXK_NUMPAD_UP ||
 878              keyCode == WXK_LEFT || keyCode == WXK_NUMPAD_LEFT ||
 879              keyCode == WXK_HOME || keyCode == WXK_NUMPAD_HOME ||
 880              keyCode == WXK_PAGEUP || keyCode == WXK_NUMPAD_PAGEUP )
 881     {
 882         if (rect.y < startY)
 883         {
 884             // Make it scroll so this item is at the top
 885             // of the window
 886             int y = rect.y ;
 887             int yUnits = (int) (0.5 + ((float) y)/(float) ppuY);
 888
 889             if (startYUnits != yUnits)
 890             {
 891                 SetScrollbars(ppuX, ppuY, sxUnits, syUnits, 0, yUnits);
 892                 scrolled = true;
 893             }
 894         }
 895         else if ((rect.y + rect.height) > (clientSize.y + startY))
 896         {
 897             // Make it scroll so this item is at the bottom
 898             // of the window
 899             int y = rect.y - (clientSize.y - rect.height);
 900             int yUnits = (int) (0.5 + ((float) y)/(float) ppuY);
 901
 902             // If we're still off the screen, scroll another line down
 903             if ((rect.y + rect.height) > (clientSize.y + (yUnits*ppuY)))
 904                 yUnits ++;
 905
 906             if (startYUnits != yUnits)
 907             {
 908                 SetScrollbars(ppuX, ppuY, sxUnits, syUnits, 0, yUnits);
 909                 scrolled = true;
 910             }
 911         }
 912     }
 913     PositionCaret();
 914
 915     return scrolled;
 916 }
 917
 918 /// Is the given position visible on the screen?
 919 bool wxRichTextCtrl::IsPositionVisible(long pos) const
 920 {
 921     wxRichTextLine* line = GetVisibleLineForCaretPosition(pos-1);
 922
 923     if (!line)
 924         return false;
 925
 926     int ppuX, ppuY;
 927     GetScrollPixelsPerUnit(& ppuX, & ppuY);
 928
 929     int startX, startY;
 930     GetViewStart(& startX, & startY);
 931     startX = 0;
 932     startY = startY * ppuY;
 933
 934     int sx = 0, sy = 0;
 935     GetVirtualSize(& sx, & sy);
 936     sx = 0;
 937     if (ppuY != 0)
 938         sy = sy/ppuY;
 939
 940     wxRect rect = line->GetRect();
 941
 942     wxSize clientSize = GetClientSize();
 943
 944     return !(((rect.y + rect.height) > (clientSize.y + startY)) || rect.y < startY);
 945 }
 946
 947 void wxRichTextCtrl::SetCaretPosition(long position, bool showAtLineStart)
 948 {
 949     m_caretPosition = position;
 950     m_caretAtLineStart = showAtLineStart;
 951 }
 952
 953 /// Move caret one visual step forward: this may mean setting a flag
 954 /// and keeping the same position if we're going from the end of one line
 955 /// to the start of the next, which may be the exact same caret position.
 956 void wxRichTextCtrl::MoveCaretForward(long oldPosition)
 957 {
 958     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(oldPosition);
 959
 960     // Only do the check if we're not at the end of the paragraph (where things work OK
 961     // anyway)
 962     if (para && (oldPosition != para->GetRange().GetEnd() - 1))
 963     {
 964         wxRichTextLine* line = GetBuffer().GetLineAtPosition(oldPosition);
 965
 966         if (line)
 967         {
 968             wxRichTextRange lineRange = line->GetAbsoluteRange();
 969
 970             // We're at the end of a line. See whether we need to
 971             // stay at the same actual caret position but change visual
 972             // position, or not.
 973             if (oldPosition == lineRange.GetEnd())
 974             {
 975                 if (m_caretAtLineStart)
 976                 {
 977                     // We're already at the start of the line, so actually move on now.
 978                     m_caretPosition = oldPosition + 1;
 979                     m_caretAtLineStart = false;
 980                 }
 981                 else
 982                 {
 983                     // We're showing at the end of the line, so keep to
 984                     // the same position but indicate that we're to show
 985                     // at the start of the next line.
 986                     m_caretPosition = oldPosition;
 987                     m_caretAtLineStart = true;
 988                 }
 989                 SetDefaultStyleToCursorStyle();
 990                 return;
 991             }
 992         }
 993     }
 994     m_caretPosition ++;
 995     SetDefaultStyleToCursorStyle();
 996 }
 997
 998 /// Move caret one visual step backward: this may mean setting a flag
 999 /// and keeping the same position if we're going from the end of one line
1000 /// to the start of the next, which may be the exact same caret position.
1001 void wxRichTextCtrl::MoveCaretBack(long oldPosition)
1002 {
1003     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(oldPosition);
1004
1005     // Only do the check if we're not at the start of the paragraph (where things work OK
1006     // anyway)
1007     if (para && (oldPosition != para->GetRange().GetStart()))
1008     {
1009         wxRichTextLine* line = GetBuffer().GetLineAtPosition(oldPosition);
1010
1011         if (line)
1012         {
1013             wxRichTextRange lineRange = line->GetAbsoluteRange();
1014
1015             // We're at the start of a line. See whether we need to
1016             // stay at the same actual caret position but change visual
1017             // position, or not.
1018             if (oldPosition == lineRange.GetStart())
1019             {
1020                 m_caretPosition = oldPosition-1;
1021                 m_caretAtLineStart = true;
1022                 return;
1023             }
1024             else if (oldPosition == lineRange.GetEnd())
1025             {
1026                 if (m_caretAtLineStart)
1027                 {
1028                     // We're at the start of the line, so keep the same caret position
1029                     // but clear the start-of-line flag.
1030                     m_caretPosition = oldPosition;
1031                     m_caretAtLineStart = false;
1032                 }
1033                 else
1034                 {
1035                     // We're showing at the end of the line, so go back
1036                     // to the previous character position.
1037                     m_caretPosition = oldPosition - 1;
1038                 }
1039                 SetDefaultStyleToCursorStyle();
1040                 return;
1041             }
1042         }
1043     }
1044     m_caretPosition --;
1045     SetDefaultStyleToCursorStyle();
1046 }
1047
1048 /// Move right
1049 bool wxRichTextCtrl::MoveRight(int noPositions, int flags)
1050 {
1051     long endPos = GetBuffer().GetRange().GetEnd();
1052
1053     if (m_caretPosition + noPositions < endPos)
1054     {
1055         long oldPos = m_caretPosition;
1056         long newPos = m_caretPosition + noPositions;
1057
1058         bool extendSel = ExtendSelection(m_caretPosition, newPos, flags);
1059         if (!extendSel)
1060             SelectNone();
1061
1062         // Determine by looking at oldPos and m_caretPosition whether
1063         // we moved from the end of a line to the start of the next line, in which case
1064         // we want to adjust the caret position such that it is positioned at the
1065         // start of the next line, rather than jumping past the first character of the
1066         // line.
1067         if (noPositions == 1 && !extendSel)
1068             MoveCaretForward(oldPos);
1069         else
1070             SetCaretPosition(newPos);
1071
1072         PositionCaret();
1073         SetDefaultStyleToCursorStyle();
1074
1075         if (extendSel)
1076             Refresh(false);
1077         return true;
1078     }
1079     else
1080         return false;
1081 }
1082
1083 /// Move left
1084 bool wxRichTextCtrl::MoveLeft(int noPositions, int flags)
1085 {
1086     long startPos = -1;
1087
1088     if (m_caretPosition > startPos - noPositions + 1)
1089     {
1090         long oldPos = m_caretPosition;
1091         long newPos = m_caretPosition - noPositions;
1092         bool extendSel = ExtendSelection(m_caretPosition, newPos, flags);
1093         if (!extendSel)
1094             SelectNone();
1095
1096         if (noPositions == 1 && !extendSel)
1097             MoveCaretBack(oldPos);
1098         else
1099             SetCaretPosition(newPos);
1100
1101         PositionCaret();
1102         SetDefaultStyleToCursorStyle();
1103
1104         if (extendSel)
1105             Refresh(false);
1106         return true;
1107     }
1108     else
1109         return false;
1110 }
1111
1112 /// Move up
1113 bool wxRichTextCtrl::MoveUp(int noLines, int flags)
1114 {
1115     return MoveDown(- noLines, flags);
1116 }
1117
1118 /// Move up
1119 bool wxRichTextCtrl::MoveDown(int noLines, int flags)
1120 {
1121     if (!GetCaret())
1122         return false;
1123
1124     long lineNumber = GetBuffer().GetVisibleLineNumber(m_caretPosition, true, m_caretAtLineStart);
1125     wxPoint pt = GetCaret()->GetPosition();
1126     long newLine = lineNumber + noLines;
1127
1128     if (lineNumber != -1)
1129     {
1130         if (noLines > 0)
1131         {
1132             long lastLine = GetBuffer().GetVisibleLineNumber(GetBuffer().GetRange().GetEnd());
1133
1134             if (newLine > lastLine)
1135                 return false;
1136         }
1137         else
1138         {
1139             if (newLine < 0)
1140                 return false;
1141         }
1142     }
1143
1144     wxRichTextLine* lineObj = GetBuffer().GetLineForVisibleLineNumber(newLine);
1145     if (lineObj)
1146     {
1147         pt.y = lineObj->GetAbsolutePosition().y + 2;
1148     }
1149     else
1150         return false;
1151
1152     long newPos = 0;
1153     wxClientDC dc(this);
1154     PrepareDC(dc);
1155     dc.SetFont(GetFont());
1156
1157     int hitTest = GetBuffer().HitTest(dc, pt, newPos);
1158
1159     if (hitTest != wxRICHTEXT_HITTEST_NONE)
1160     {
1161         // If end of previous line, and hitTest is wxRICHTEXT_HITTEST_BEFORE,
1162         // we want to be at the end of the last line but with m_caretAtLineStart set to true,
1163         // so we view the caret at the start of the line.
1164         bool caretLineStart = false;
1165         if (hitTest == wxRICHTEXT_HITTEST_BEFORE)
1166         {
1167             wxRichTextLine* thisLine = GetBuffer().GetLineAtPosition(newPos-1);
1168             wxRichTextRange lineRange;
1169             if (thisLine)
1170                 lineRange = thisLine->GetAbsoluteRange();
1171
1172             if (thisLine && (newPos-1) == lineRange.GetEnd())
1173             {
1174                 newPos --;
1175                 caretLineStart = true;
1176             }
1177             else
1178             {
1179                 wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(newPos);
1180                 if (para && para->GetRange().GetStart() == newPos)
1181                     newPos --;
1182             }
1183         }
1184
1185         long newSelEnd = newPos;
1186
1187         bool extendSel = ExtendSelection(m_caretPosition, newSelEnd, flags);
1188         if (!extendSel)
1189             SelectNone();
1190
1191         SetCaretPosition(newPos, caretLineStart);
1192         PositionCaret();
1193         SetDefaultStyleToCursorStyle();
1194
1195         if (extendSel)
1196             Refresh(false);
1197         return true;
1198     }
1199
1200     return false;
1201 }
1202
1203 /// Move to the end of the paragraph
1204 bool wxRichTextCtrl::MoveToParagraphEnd(int flags)
1205 {
1206     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(m_caretPosition, true);
1207     if (para)
1208     {
1209         long newPos = para->GetRange().GetEnd() - 1;
1210         bool extendSel = ExtendSelection(m_caretPosition, newPos, flags);
1211         if (!extendSel)
1212             SelectNone();
1213
1214         SetCaretPosition(newPos);
1215         PositionCaret();
1216         SetDefaultStyleToCursorStyle();
1217
1218         if (extendSel)
1219             Refresh(false);
1220         return true;
1221     }
1222
1223     return false;
1224 }
1225
1226 /// Move to the start of the paragraph
1227 bool wxRichTextCtrl::MoveToParagraphStart(int flags)
1228 {
1229     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(m_caretPosition, true);
1230     if (para)
1231     {
1232         long newPos = para->GetRange().GetStart() - 1;
1233         bool extendSel = ExtendSelection(m_caretPosition, newPos, flags);
1234         if (!extendSel)
1235             SelectNone();
1236
1237         SetCaretPosition(newPos);
1238         PositionCaret();
1239         SetDefaultStyleToCursorStyle();
1240
1241         if (extendSel)
1242             Refresh(false);
1243         return true;
1244     }
1245
1246     return false;
1247 }
1248
1249 /// Move to the end of the line
1250 bool wxRichTextCtrl::MoveToLineEnd(int flags)
1251 {
1252     wxRichTextLine* line = GetVisibleLineForCaretPosition(m_caretPosition);
1253
1254     if (line)
1255     {
1256         wxRichTextRange lineRange = line->GetAbsoluteRange();
1257         long newPos = lineRange.GetEnd();
1258         bool extendSel = ExtendSelection(m_caretPosition, newPos, flags);
1259         if (!extendSel)
1260             SelectNone();
1261
1262         SetCaretPosition(newPos);
1263         PositionCaret();
1264         SetDefaultStyleToCursorStyle();
1265
1266         if (extendSel)
1267             Refresh(false);
1268         return true;
1269     }
1270
1271     return false;
1272 }
1273
1274 /// Move to the start of the line
1275 bool wxRichTextCtrl::MoveToLineStart(int flags)
1276 {
1277     wxRichTextLine* line = GetVisibleLineForCaretPosition(m_caretPosition);
1278     if (line)
1279     {
1280         wxRichTextRange lineRange = line->GetAbsoluteRange();
1281         long newPos = lineRange.GetStart()-1;
1282
1283         bool extendSel = ExtendSelection(m_caretPosition, newPos, flags);
1284         if (!extendSel)
1285             SelectNone();
1286
1287         wxRichTextParagraph* para = GetBuffer().GetParagraphForLine(line);
1288
1289         SetCaretPosition(newPos, para->GetRange().GetStart() != lineRange.GetStart());
1290         PositionCaret();
1291         SetDefaultStyleToCursorStyle();
1292
1293         if (extendSel)
1294             Refresh(false);
1295         return true;
1296     }
1297
1298     return false;
1299 }
1300
1301 /// Move to the start of the buffer
1302 bool wxRichTextCtrl::MoveHome(int flags)
1303 {
1304     if (m_caretPosition != -1)
1305     {
1306         bool extendSel = ExtendSelection(m_caretPosition, -1, flags);
1307         if (!extendSel)
1308             SelectNone();
1309
1310         SetCaretPosition(-1);
1311         PositionCaret();
1312         SetDefaultStyleToCursorStyle();
1313
1314         if (extendSel)
1315             Refresh(false);
1316         return true;
1317     }
1318     else
1319         return false;
1320 }
1321
1322 /// Move to the end of the buffer
1323 bool wxRichTextCtrl::MoveEnd(int flags)
1324 {
1325     long endPos = GetBuffer().GetRange().GetEnd()-1;
1326
1327     if (m_caretPosition != endPos)
1328     {
1329         bool extendSel = ExtendSelection(m_caretPosition, endPos, flags);
1330         if (!extendSel)
1331             SelectNone();
1332
1333         SetCaretPosition(endPos);
1334         PositionCaret();
1335         SetDefaultStyleToCursorStyle();
1336
1337         if (extendSel)
1338             Refresh(false);
1339         return true;
1340     }
1341     else
1342         return false;
1343 }
1344
1345 /// Move noPages pages up
1346 bool wxRichTextCtrl::PageUp(int noPages, int flags)
1347 {
1348     return PageDown(- noPages, flags);
1349 }
1350
1351 /// Move noPages pages down
1352 bool wxRichTextCtrl::PageDown(int noPages, int flags)
1353 {
1354     // Calculate which line occurs noPages * screen height further down.
1355     wxRichTextLine* line = GetVisibleLineForCaretPosition(m_caretPosition);
1356     if (line)
1357     {
1358         wxSize clientSize = GetClientSize();
1359         int newY = line->GetAbsolutePosition().y + noPages*clientSize.y;
1360
1361         wxRichTextLine* newLine = GetBuffer().GetLineAtYPosition(newY);
1362         if (newLine)
1363         {
1364             wxRichTextRange lineRange = newLine->GetAbsoluteRange();
1365             long pos = lineRange.GetStart()-1;
1366             if (pos != m_caretPosition)
1367             {
1368                 wxRichTextParagraph* para = GetBuffer().GetParagraphForLine(newLine);
1369
1370                 bool extendSel = ExtendSelection(m_caretPosition, pos, flags);
1371                 if (!extendSel)
1372                     SelectNone();
1373
1374                 SetCaretPosition(pos, para->GetRange().GetStart() != lineRange.GetStart());
1375                 PositionCaret();
1376                 SetDefaultStyleToCursorStyle();
1377
1378                 if (extendSel)
1379                     Refresh(false);
1380                 return true;
1381             }
1382         }
1383     }
1384
1385     return false;
1386 }
1387
1388 // Finds the caret position for the next word
1389 long wxRichTextCtrl::FindNextWordPosition(int direction) const
1390 {
1391     long endPos = GetBuffer().GetRange().GetEnd();
1392
1393     if (direction > 0)
1394     {
1395         long i = m_caretPosition+1+direction; // +1 for conversion to character pos
1396
1397         // First skip current text to space
1398         while (i < endPos && i > -1)
1399         {
1400             // i is in character, not caret positions
1401             wxString text = GetBuffer().GetTextForRange(wxRichTextRange(i, i));
1402             if (text != wxT(" ") && !text.empty())
1403                 i += direction;
1404             else
1405             {
1406                 break;
1407             }
1408         }
1409         while (i < endPos && i > -1)
1410         {
1411             // i is in character, not caret positions
1412             wxString text = GetBuffer().GetTextForRange(wxRichTextRange(i, i));
1413             if (text.empty()) // End of paragraph, or maybe an image
1414                 return wxMax(-1, i - 1);
1415             else if (text == wxT(" ") || text.empty())
1416                 i += direction;
1417             else
1418             {
1419                 // Convert to caret position
1420                 return wxMax(-1, i - 1);
1421             }
1422         }
1423         if (i >= endPos)
1424             return endPos-1;
1425         return i-1;
1426     }
1427     else
1428     {
1429         long i = m_caretPosition;
1430
1431         // First skip white space
1432         while (i < endPos && i > -1)
1433         {
1434             // i is in character, not caret positions
1435             wxString text = GetBuffer().GetTextForRange(wxRichTextRange(i, i));
1436             if (text.empty()) // End of paragraph, or maybe an image
1437                 break;
1438             else if (text == wxT(" ") || text.empty())
1439                 i += direction;
1440             else
1441                 break;
1442         }
1443         // Next skip current text to space
1444         while (i < endPos && i > -1)
1445         {
1446             // i is in character, not caret positions
1447             wxString text = GetBuffer().GetTextForRange(wxRichTextRange(i, i));
1448             if (text != wxT(" ") /* && !text.empty() */)
1449                 i += direction;
1450             else
1451             {
1452                 return i;
1453             }
1454         }
1455         if (i < -1)
1456             return -1;
1457         return i;
1458     }
1459 }
1460
1461 /// Move n words left
1462 bool wxRichTextCtrl::WordLeft(int WXUNUSED(n), int flags)
1463 {
1464     long pos = FindNextWordPosition(-1);
1465     if (pos != m_caretPosition)
1466     {
1467         wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(pos, true);
1468
1469         bool extendSel = ExtendSelection(m_caretPosition, pos, flags);
1470         if (!extendSel)
1471             SelectNone();
1472
1473         SetCaretPosition(pos, para->GetRange().GetStart() != pos);
1474         PositionCaret();
1475         SetDefaultStyleToCursorStyle();
1476
1477         if (extendSel)
1478             Refresh(false);
1479         return true;
1480     }
1481
1482     return false;
1483 }
1484
1485 /// Move n words right
1486 bool wxRichTextCtrl::WordRight(int WXUNUSED(n), int flags)
1487 {
1488     long pos = FindNextWordPosition(1);
1489     if (pos != m_caretPosition)
1490     {
1491         wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(pos, true);
1492
1493         bool extendSel = ExtendSelection(m_caretPosition, pos, flags);
1494         if (!extendSel)
1495             SelectNone();
1496
1497         SetCaretPosition(pos, para->GetRange().GetStart() != pos);
1498         PositionCaret();
1499         SetDefaultStyleToCursorStyle();
1500
1501         if (extendSel)
1502             Refresh(false);
1503         return true;
1504     }
1505
1506     return false;
1507 }
1508
1509 /// Sizing
1510 void wxRichTextCtrl::OnSize(wxSizeEvent& event)
1511 {
1512     // Only do sizing optimization for large buffers
1513     if (GetBuffer().GetRange().GetEnd() > m_delayedLayoutThreshold)
1514     {
1515         m_fullLayoutRequired = true;
1516         m_fullLayoutTime = wxGetLocalTimeMillis();
1517         m_fullLayoutSavedPosition = GetFirstVisiblePosition();
1518         LayoutContent(true /* onlyVisibleRect */);
1519     }
1520     else
1521         GetBuffer().Invalidate(wxRICHTEXT_ALL);
1522
1523 #if wxRICHTEXT_BUFFERED_PAINTING
1524     RecreateBuffer();
1525 #endif
1526
1527     event.Skip();
1528 }
1529
1530
1531 /// Idle-time processing
1532 void wxRichTextCtrl::OnIdle(wxIdleEvent& event)
1533 {
1534     const int layoutInterval = wxRICHTEXT_DEFAULT_LAYOUT_INTERVAL;
1535
1536     if (m_fullLayoutRequired && (wxGetLocalTimeMillis() > (m_fullLayoutTime + layoutInterval)))
1537     {
1538         m_fullLayoutRequired = false;
1539         m_fullLayoutTime = 0;
1540         GetBuffer().Invalidate(wxRICHTEXT_ALL);
1541         ShowPosition(m_fullLayoutSavedPosition);
1542         Refresh(false);
1543     }
1544
1545     if (m_caretPositionForDefaultStyle != -2)
1546     {
1547         // If the caret position has changed, no longer reflect the default style
1548         // in the UI.
1549         if (GetCaretPosition() != m_caretPositionForDefaultStyle)
1550             m_caretPositionForDefaultStyle = -2;
1551     }
1552
1553     event.Skip();
1554 }
1555
1556 /// Scrolling
1557 void wxRichTextCtrl::OnScroll(wxScrollWinEvent& event)
1558 {
1559     // Not used
1560     event.Skip();
1561 }
1562
1563 /// Set up scrollbars, e.g. after a resize
1564 void wxRichTextCtrl::SetupScrollbars(bool atTop)
1565 {
1566     if (m_freezeCount)
1567         return;
1568
1569     if (GetBuffer().IsEmpty())
1570     {
1571         SetScrollbars(0, 0, 0, 0, 0, 0);
1572         return;
1573     }
1574
1575     // TODO: reimplement scrolling so we scroll by line, not by fixed number
1576     // of pixels. See e.g. wxVScrolledWindow for ideas.
1577     int pixelsPerUnit = 5;
1578     wxSize clientSize = GetClientSize();
1579
1580     int maxHeight = GetBuffer().GetCachedSize().y;
1581
1582     // Round up so we have at least maxHeight pixels
1583     int unitsY = (int) (((float)maxHeight/(float)pixelsPerUnit) + 0.5);
1584
1585     int startX = 0, startY = 0;
1586     if (!atTop)
1587         GetViewStart(& startX, & startY);
1588
1589     int maxPositionX = 0; // wxMax(sz.x - clientSize.x, 0);
1590     int maxPositionY = (int) ((((float)(wxMax((unitsY*pixelsPerUnit) - clientSize.y, 0)))/((float)pixelsPerUnit)) + 0.5);
1591
1592     // Move to previous scroll position if
1593     // possible
1594     SetScrollbars(0, pixelsPerUnit,
1595         0, unitsY,
1596         wxMin(maxPositionX, startX), wxMin(maxPositionY, startY));
1597 }
1598
1599 /// Paint the background
1600 void wxRichTextCtrl::PaintBackground(wxDC& dc)
1601 {
1602     wxColour backgroundColour = GetBackgroundColour();
1603     if (!backgroundColour.Ok())
1604         backgroundColour = wxSystemSettings::GetColour(wxSYS_COLOUR_3DFACE);
1605
1606     // Clear the background
1607     dc.SetBrush(wxBrush(backgroundColour));
1608     dc.SetPen(*wxTRANSPARENT_PEN);
1609     wxRect windowRect(GetClientSize());
1610     windowRect.x -= 2; windowRect.y -= 2;
1611     windowRect.width += 4; windowRect.height += 4;
1612
1613     // We need to shift the rectangle to take into account
1614     // scrolling. Converting device to logical coordinates.
1615     CalcUnscrolledPosition(windowRect.x, windowRect.y, & windowRect.x, & windowRect.y);
1616     dc.DrawRectangle(windowRect);
1617 }
1618
1619 #if wxRICHTEXT_BUFFERED_PAINTING
1620 /// Recreate buffer bitmap if necessary
1621 bool wxRichTextCtrl::RecreateBuffer(const wxSize& size)
1622 {
1623     wxSize sz = size;
1624     if (sz == wxDefaultSize)
1625         sz = GetClientSize();
1626
1627     if (sz.x < 1 || sz.y < 1)
1628         return false;
1629
1630     if (!m_bufferBitmap.Ok() || m_bufferBitmap.GetWidth() < sz.x || m_bufferBitmap.GetHeight() < sz.y)
1631         m_bufferBitmap = wxBitmap(sz.x, sz.y);
1632     return m_bufferBitmap.Ok();
1633 }
1634 #endif
1635
1636 // ----------------------------------------------------------------------------
1637 // file IO functions
1638 // ----------------------------------------------------------------------------
1639
1640 bool wxRichTextCtrl::DoLoadFile(const wxString& filename, int fileType)
1641 {
1642     bool success = GetBuffer().LoadFile(filename, fileType);
1643     if (success)
1644         m_filename = filename;
1645
1646     DiscardEdits();
1647     SetInsertionPoint(0);
1648     LayoutContent();
1649     PositionCaret();
1650     SetupScrollbars(true);
1651     Refresh(false);
1652     SendTextUpdatedEvent();
1653
1654     if (success)
1655         return true;
1656     else
1657     {
1658         wxLogError(_("File couldn't be loaded."));
1659
1660         return false;
1661     }
1662 }
1663
1664 bool wxRichTextCtrl::DoSaveFile(const wxString& filename, int fileType)
1665 {
1666     if (GetBuffer().SaveFile(filename, fileType))
1667     {
1668         m_filename = filename;
1669
1670         DiscardEdits();
1671
1672         return true;
1673     }
1674
1675     wxLogError(_("The text couldn't be saved."));
1676
1677     return false;
1678 }
1679
1680 // ----------------------------------------------------------------------------
1681 // wxRichTextCtrl specific functionality
1682 // ----------------------------------------------------------------------------
1683
1684 /// Add a new paragraph of text to the end of the buffer
1685 wxRichTextRange wxRichTextCtrl::AddParagraph(const wxString& text)
1686 {
1687     return GetBuffer().AddParagraph(text);
1688 }
1689
1690 /// Add an image
1691 wxRichTextRange wxRichTextCtrl::AddImage(const wxImage& image)
1692 {
1693     return GetBuffer().AddImage(image);
1694 }
1695
1696 // ----------------------------------------------------------------------------
1697 // selection and ranges
1698 // ----------------------------------------------------------------------------
1699
1700 void wxRichTextCtrl::SelectAll()
1701 {
1702     SetSelection(0, GetLastPosition()+1);
1703     m_selectionAnchor = -1;
1704 }
1705
1706 /// Select none
1707 void wxRichTextCtrl::SelectNone()
1708 {
1709     if (!(GetSelectionRange() == wxRichTextRange(-2, -2)))
1710         SetSelection(-2, -2);
1711     m_selectionAnchor = -2;
1712 }
1713
1714 static bool wxIsWordDelimiter(const wxString& text)
1715 {
1716     return !text.IsEmpty() && !wxIsalnum(text[0]);
1717 }
1718
1719 /// Select the word at the given character position
1720 bool wxRichTextCtrl::SelectWord(long position)
1721 {
1722     if (position < 0 || position > GetBuffer().GetRange().GetEnd())
1723         return false;
1724
1725     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(position);
1726     if (!para)
1727         return false;
1728
1729     long positionStart = position;
1730     long positionEnd = position;
1731
1732     for (positionStart = position; positionStart >= para->GetRange().GetStart(); positionStart --)
1733     {
1734         wxString text = GetBuffer().GetTextForRange(wxRichTextRange(positionStart, positionStart));
1735         if (wxIsWordDelimiter(text))
1736         {
1737             positionStart ++;
1738             break;
1739         }
1740     }
1741     if (positionStart < para->GetRange().GetStart())
1742         positionStart = para->GetRange().GetStart();
1743
1744     for (positionEnd = position; positionEnd < para->GetRange().GetEnd(); positionEnd ++)
1745     {
1746         wxString text = GetBuffer().GetTextForRange(wxRichTextRange(positionEnd, positionEnd));
1747         if (wxIsWordDelimiter(text))
1748         {
1749             positionEnd --;
1750             break;
1751         }
1752     }
1753     if (positionEnd >= para->GetRange().GetEnd())
1754         positionEnd = para->GetRange().GetEnd();
1755
1756     SetSelection(positionStart, positionEnd+1);
1757
1758     if (positionStart >= 0)
1759     {
1760         MoveCaret(positionStart-1, true);
1761         SetDefaultStyleToCursorStyle();
1762     }
1763
1764     return true;
1765 }
1766
1767 wxString wxRichTextCtrl::GetStringSelection() const
1768 {
1769     long from, to;
1770     GetSelection(&from, &to);
1771
1772     return GetRange(from, to);
1773 }
1774
1775 // ----------------------------------------------------------------------------
1776 // hit testing
1777 // ----------------------------------------------------------------------------
1778
1779 wxTextCtrlHitTestResult
1780 wxRichTextCtrl::HitTest(const wxPoint& pt, wxTextCoord *x, wxTextCoord *y) const
1781 {
1782     // implement in terms of the other overload as the native ports typically
1783     // can get the position and not (x, y) pair directly (although wxUniv
1784     // directly gets x and y -- and so overrides this method as well)
1785     long pos;
1786     wxTextCtrlHitTestResult rc = HitTest(pt, &pos);
1787
1788     if ( rc != wxTE_HT_UNKNOWN )
1789     {
1790         PositionToXY(pos, x, y);
1791     }
1792
1793     return rc;
1794 }
1795
1796 wxTextCtrlHitTestResult
1797 wxRichTextCtrl::HitTest(const wxPoint& pt,
1798                         long * pos) const
1799 {
1800     wxClientDC dc((wxRichTextCtrl*) this);
1801     ((wxRichTextCtrl*)this)->PrepareDC(dc);
1802
1803     // Buffer uses logical position (relative to start of buffer)
1804     // so convert
1805     wxPoint pt2 = GetLogicalPoint(pt);
1806
1807     int hit = ((wxRichTextCtrl*)this)->GetBuffer().HitTest(dc, pt2, *pos);
1808
1809     switch ( hit )
1810     {
1811         case wxRICHTEXT_HITTEST_BEFORE:
1812             return wxTE_HT_BEFORE;
1813
1814         case wxRICHTEXT_HITTEST_AFTER:
1815             return wxTE_HT_BEYOND;
1816
1817         case wxRICHTEXT_HITTEST_ON:
1818             return wxTE_HT_ON_TEXT;
1819     }
1820
1821     return wxTE_HT_UNKNOWN;
1822 }
1823
1824 // ----------------------------------------------------------------------------
1825 // set/get the controls text
1826 // ----------------------------------------------------------------------------
1827
1828 wxString wxRichTextCtrl::GetValue() const
1829 {
1830     return GetBuffer().GetText();
1831 }
1832
1833 wxString wxRichTextCtrl::GetRange(long from, long to) const
1834 {
1835     // Public API for range is different from internals
1836     return GetBuffer().GetTextForRange(wxRichTextRange(from, to-1));
1837 }
1838
1839 void wxRichTextCtrl::DoSetValue(const wxString& value, int flags)
1840 {
1841     Clear();
1842
1843     // if the text is long enough, it's faster to just set it instead of first
1844     // comparing it with the old one (chances are that it will be different
1845     // anyhow, this comparison is there to avoid flicker for small single-line
1846     // edit controls mostly)
1847     if ( (value.length() > 0x400) || (value != GetValue()) )
1848     {
1849         DoWriteText(value);
1850
1851         // for compatibility, don't move the cursor when doing SetValue()
1852         SetInsertionPoint(0);
1853     }
1854     else // same text
1855     {
1856         if ( flags & SetValue_SendEvent )
1857         {
1858             // still send an event for consistency
1859             SendTextUpdatedEvent();
1860         }
1861     }
1862
1863     // we should reset the modified flag even if the value didn't really change
1864
1865     // mark the control as being not dirty - we changed its text, not the
1866     // user
1867     DiscardEdits();
1868 }
1869
1870 void wxRichTextCtrl::WriteText(const wxString& value)
1871 {
1872     DoWriteText(value);
1873 }
1874
1875 void wxRichTextCtrl::DoWriteText(const wxString& value, int flags)
1876 {
1877     wxString valueUnix = wxTextFile::Translate(value, wxTextFileType_Unix);
1878
1879     GetBuffer().InsertTextWithUndo(m_caretPosition+1, valueUnix, this);
1880
1881     if ( flags & SetValue_SendEvent )
1882         SendTextUpdatedEvent();
1883 }
1884
1885 void wxRichTextCtrl::AppendText(const wxString& text)
1886 {
1887     SetInsertionPointEnd();
1888
1889     WriteText(text);
1890 }
1891
1892 /// Write an image at the current insertion point
1893 bool wxRichTextCtrl::WriteImage(const wxImage& image, int bitmapType)
1894 {
1895     wxRichTextImageBlock imageBlock;
1896
1897     wxImage image2 = image;
1898     if (imageBlock.MakeImageBlock(image2, bitmapType))
1899         return WriteImage(imageBlock);
1900
1901     return false;
1902 }
1903
1904 bool wxRichTextCtrl::WriteImage(const wxString& filename, int bitmapType)
1905 {
1906     wxRichTextImageBlock imageBlock;
1907
1908     wxImage image;
1909     if (imageBlock.MakeImageBlock(filename, bitmapType, image, false))
1910         return WriteImage(imageBlock);
1911
1912     return false;
1913 }
1914
1915 bool wxRichTextCtrl::WriteImage(const wxRichTextImageBlock& imageBlock)
1916 {
1917     return GetBuffer().InsertImageWithUndo(m_caretPosition+1, imageBlock, this);
1918 }
1919
1920 bool wxRichTextCtrl::WriteImage(const wxBitmap& bitmap, int bitmapType)
1921 {
1922     if (bitmap.Ok())
1923     {
1924         wxRichTextImageBlock imageBlock;
1925
1926         wxImage image = bitmap.ConvertToImage();
1927         if (image.Ok() && imageBlock.MakeImageBlock(image, bitmapType))
1928             return WriteImage(imageBlock);
1929     }
1930
1931     return false;
1932 }
1933
1934 /// Insert a newline (actually paragraph) at the current insertion point.
1935 bool wxRichTextCtrl::Newline()
1936 {
1937     return GetBuffer().InsertNewlineWithUndo(m_caretPosition+1, this);
1938 }
1939
1940
1941 // ----------------------------------------------------------------------------
1942 // Clipboard operations
1943 // ----------------------------------------------------------------------------
1944
1945 void wxRichTextCtrl::Copy()
1946 {
1947     if (CanCopy())
1948     {
1949         wxRichTextRange range = GetInternalSelectionRange();
1950         GetBuffer().CopyToClipboard(range);
1951     }
1952 }
1953
1954 void wxRichTextCtrl::Cut()
1955 {
1956     if (CanCut())
1957     {
1958         wxRichTextRange range = GetInternalSelectionRange();
1959         GetBuffer().CopyToClipboard(range);
1960
1961         DeleteSelectedContent();
1962         LayoutContent();
1963         Refresh(false);
1964     }
1965 }
1966
1967 void wxRichTextCtrl::Paste()
1968 {
1969     if (CanPaste())
1970     {
1971         BeginBatchUndo(_("Paste"));
1972
1973         long newPos = m_caretPosition;
1974         DeleteSelectedContent(& newPos);
1975
1976         GetBuffer().PasteFromClipboard(newPos);
1977
1978         EndBatchUndo();
1979     }
1980 }
1981
1982 void wxRichTextCtrl::DeleteSelection()
1983 {
1984     if (CanDeleteSelection())
1985     {
1986         DeleteSelectedContent();
1987     }
1988 }
1989
1990 bool wxRichTextCtrl::HasSelection() const
1991 {
1992     return m_selectionRange.GetStart() != -2 && m_selectionRange.GetEnd() != -2;
1993 }
1994
1995 bool wxRichTextCtrl::CanCopy() const
1996 {
1997     // Can copy if there's a selection
1998     return HasSelection();
1999 }
2000
2001 bool wxRichTextCtrl::CanCut() const
2002 {
2003     return HasSelection() && IsEditable();
2004 }
2005
2006 bool wxRichTextCtrl::CanPaste() const
2007 {
2008     if ( !IsEditable() )
2009         return false;
2010
2011     return GetBuffer().CanPasteFromClipboard();
2012 }
2013
2014 bool wxRichTextCtrl::CanDeleteSelection() const
2015 {
2016     return HasSelection() && IsEditable();
2017 }
2018
2019
2020 // ----------------------------------------------------------------------------
2021 // Accessors
2022 // ----------------------------------------------------------------------------
2023
2024 void wxRichTextCtrl::SetEditable(bool editable)
2025 {
2026     m_editable = editable;
2027 }
2028
2029 void wxRichTextCtrl::SetInsertionPoint(long pos)
2030 {
2031     SelectNone();
2032
2033     m_caretPosition = pos - 1;
2034 }
2035
2036 void wxRichTextCtrl::SetInsertionPointEnd()
2037 {
2038     long pos = GetLastPosition();
2039     SetInsertionPoint(pos);
2040 }
2041
2042 long wxRichTextCtrl::GetInsertionPoint() const
2043 {
2044     return m_caretPosition+1;
2045 }
2046
2047 wxTextPos wxRichTextCtrl::GetLastPosition() const
2048 {
2049     return GetBuffer().GetRange().GetEnd();
2050 }
2051
2052 // If the return values from and to are the same, there is no
2053 // selection.
2054 void wxRichTextCtrl::GetSelection(long* from, long* to) const
2055 {
2056     *from = m_selectionRange.GetStart();
2057     *to = m_selectionRange.GetEnd();
2058     if ((*to) != -1 && (*to) != -2)
2059         (*to) ++;
2060 }
2061
2062 bool wxRichTextCtrl::IsEditable() const
2063 {
2064     return m_editable;
2065 }
2066
2067 // ----------------------------------------------------------------------------
2068 // selection
2069 // ----------------------------------------------------------------------------
2070
2071 void wxRichTextCtrl::SetSelection(long from, long to)
2072 {
2073     // if from and to are both -1, it means (in wxWidgets) that all text should
2074     // be selected.
2075     if ( (from == -1) && (to == -1) )
2076     {
2077         from = 0;
2078         to = GetLastPosition()+1;
2079     }
2080
2081     DoSetSelection(from, to);
2082 }
2083
2084 void wxRichTextCtrl::DoSetSelection(long from, long to, bool WXUNUSED(scrollCaret))
2085 {
2086     m_selectionAnchor = from;
2087     m_selectionRange.SetRange(from, to-1);
2088
2089     Refresh(false);
2090     PositionCaret();
2091 }
2092
2093 // ----------------------------------------------------------------------------
2094 // Editing
2095 // ----------------------------------------------------------------------------
2096
2097 void wxRichTextCtrl::Replace(long WXUNUSED(from), long WXUNUSED(to),
2098                              const wxString& value)
2099 {
2100     BeginBatchUndo(_("Replace"));
2101
2102     DeleteSelectedContent();
2103
2104     DoWriteText(value, SetValue_SelectionOnly);
2105
2106     EndBatchUndo();
2107 }
2108
2109 void wxRichTextCtrl::Remove(long from, long to)
2110 {
2111     SelectNone();
2112
2113     GetBuffer().DeleteRangeWithUndo(wxRichTextRange(from, to),
2114         m_caretPosition,       // Current caret position
2115         from,                           // New caret position
2116         this);
2117
2118     LayoutContent();
2119     if (!IsFrozen())
2120         Refresh(false);
2121 }
2122
2123 bool wxRichTextCtrl::IsModified() const
2124 {
2125     return m_buffer.IsModified();
2126 }
2127
2128 void wxRichTextCtrl::MarkDirty()
2129 {
2130     m_buffer.Modify(true);
2131 }
2132
2133 void wxRichTextCtrl::DiscardEdits()
2134 {
2135     m_caretPositionForDefaultStyle = -2;
2136     m_buffer.Modify(false);
2137     m_buffer.GetCommandProcessor()->ClearCommands();
2138 }
2139
2140 int wxRichTextCtrl::GetNumberOfLines() const
2141 {
2142     return GetBuffer().GetParagraphCount();
2143 }
2144
2145 // ----------------------------------------------------------------------------
2146 // Positions <-> coords
2147 // ----------------------------------------------------------------------------
2148
2149 long wxRichTextCtrl::XYToPosition(long x, long y) const
2150 {
2151     return GetBuffer().XYToPosition(x, y);
2152 }
2153
2154 bool wxRichTextCtrl::PositionToXY(long pos, long *x, long *y) const
2155 {
2156     return GetBuffer().PositionToXY(pos, x, y);
2157 }
2158
2159 // ----------------------------------------------------------------------------
2160 //
2161 // ----------------------------------------------------------------------------
2162
2163 void wxRichTextCtrl::ShowPosition(long pos)
2164 {
2165     if (!IsPositionVisible(pos))
2166         ScrollIntoView(pos-1, WXK_DOWN);
2167 }
2168
2169 int wxRichTextCtrl::GetLineLength(long lineNo) const
2170 {
2171     return GetBuffer().GetParagraphLength(lineNo);
2172 }
2173
2174 wxString wxRichTextCtrl::GetLineText(long lineNo) const
2175 {
2176     return GetBuffer().GetParagraphText(lineNo);
2177 }
2178
2179 // ----------------------------------------------------------------------------
2180 // Undo/redo
2181 // ----------------------------------------------------------------------------
2182
2183 void wxRichTextCtrl::Undo()
2184 {
2185     if (CanUndo())
2186     {
2187         GetCommandProcessor()->Undo();
2188     }
2189 }
2190
2191 void wxRichTextCtrl::Redo()
2192 {
2193     if (CanRedo())
2194     {
2195         GetCommandProcessor()->Redo();
2196     }
2197 }
2198
2199 bool wxRichTextCtrl::CanUndo() const
2200 {
2201     return GetCommandProcessor()->CanUndo();
2202 }
2203
2204 bool wxRichTextCtrl::CanRedo() const
2205 {
2206     return GetCommandProcessor()->CanRedo();
2207 }
2208
2209 // ----------------------------------------------------------------------------
2210 // implementation details
2211 // ----------------------------------------------------------------------------
2212
2213 void wxRichTextCtrl::Command(wxCommandEvent& event)
2214 {
2215     SetValue(event.GetString());
2216     GetEventHandler()->ProcessEvent(event);
2217 }
2218
2219 void wxRichTextCtrl::OnDropFiles(wxDropFilesEvent& event)
2220 {
2221     // By default, load the first file into the text window.
2222     if (event.GetNumberOfFiles() > 0)
2223     {
2224         LoadFile(event.GetFiles()[0]);
2225     }
2226 }
2227
2228 wxSize wxRichTextCtrl::DoGetBestSize() const
2229 {
2230     return wxSize(10, 10);
2231 }
2232
2233 // ----------------------------------------------------------------------------
2234 // standard handlers for standard edit menu events
2235 // ----------------------------------------------------------------------------
2236
2237 void wxRichTextCtrl::OnCut(wxCommandEvent& WXUNUSED(event))
2238 {
2239     Cut();
2240 }
2241
2242 void wxRichTextCtrl::OnClear(wxCommandEvent& WXUNUSED(event))
2243 {
2244     DeleteSelection();
2245 }
2246
2247 void wxRichTextCtrl::OnCopy(wxCommandEvent& WXUNUSED(event))
2248 {
2249     Copy();
2250 }
2251
2252 void wxRichTextCtrl::OnPaste(wxCommandEvent& WXUNUSED(event))
2253 {
2254     Paste();
2255 }
2256
2257 void wxRichTextCtrl::OnUndo(wxCommandEvent& WXUNUSED(event))
2258 {
2259     Undo();
2260 }
2261
2262 void wxRichTextCtrl::OnRedo(wxCommandEvent& WXUNUSED(event))
2263 {
2264     Redo();
2265 }
2266
2267 void wxRichTextCtrl::OnUpdateCut(wxUpdateUIEvent& event)
2268 {
2269     event.Enable( CanCut() );
2270 }
2271
2272 void wxRichTextCtrl::OnUpdateCopy(wxUpdateUIEvent& event)
2273 {
2274     event.Enable( CanCopy() );
2275 }
2276
2277 void wxRichTextCtrl::OnUpdateClear(wxUpdateUIEvent& event)
2278 {
2279     event.Enable( CanDeleteSelection() );
2280 }
2281
2282 void wxRichTextCtrl::OnUpdatePaste(wxUpdateUIEvent& event)
2283 {
2284     event.Enable( CanPaste() );
2285 }
2286
2287 void wxRichTextCtrl::OnUpdateUndo(wxUpdateUIEvent& event)
2288 {
2289     event.Enable( CanUndo() );
2290     event.SetText( GetCommandProcessor()->GetUndoMenuLabel() );
2291 }
2292
2293 void wxRichTextCtrl::OnUpdateRedo(wxUpdateUIEvent& event)
2294 {
2295     event.Enable( CanRedo() );
2296     event.SetText( GetCommandProcessor()->GetRedoMenuLabel() );
2297 }
2298
2299 void wxRichTextCtrl::OnSelectAll(wxCommandEvent& WXUNUSED(event))
2300 {
2301     SelectAll();
2302 }
2303
2304 void wxRichTextCtrl::OnUpdateSelectAll(wxUpdateUIEvent& event)
2305 {
2306     event.Enable(GetLastPosition() > 0);
2307 }
2308
2309 void wxRichTextCtrl::OnContextMenu(wxContextMenuEvent& WXUNUSED(event))
2310 {
2311     if (!m_contextMenu)
2312     {
2313         m_contextMenu = new wxMenu;
2314         m_contextMenu->Append(wxID_UNDO, _("&Undo"));
2315         m_contextMenu->Append(wxID_REDO, _("&Redo"));
2316         m_contextMenu->AppendSeparator();
2317         m_contextMenu->Append(wxID_CUT, _("Cu&t"));
2318         m_contextMenu->Append(wxID_COPY, _("&Copy"));
2319         m_contextMenu->Append(wxID_PASTE, _("&Paste"));
2320         m_contextMenu->Append(wxID_CLEAR, _("&Delete"));
2321         m_contextMenu->AppendSeparator();
2322         m_contextMenu->Append(wxID_SELECTALL, _("Select &All"));
2323     }
2324     PopupMenu(m_contextMenu);
2325     return;
2326 }
2327
2328 bool wxRichTextCtrl::SetStyle(long start, long end, const wxTextAttrEx& style)
2329 {
2330     return GetBuffer().SetStyle(wxRichTextRange(start, end-1), style);
2331 }
2332
2333 bool wxRichTextCtrl::SetStyle(long start, long end, const wxTextAttr& style)
2334 {
2335     return GetBuffer().SetStyle(wxRichTextRange(start, end-1), wxTextAttrEx(style));
2336 }
2337
2338 bool wxRichTextCtrl::SetStyle(const wxRichTextRange& range, const wxRichTextAttr& style)
2339 {
2340     return GetBuffer().SetStyle(range.ToInternal(), style);
2341 }
2342
2343 // extended style setting operation with flags including:
2344 // wxRICHTEXT_SETSTYLE_WITH_UNDO, wxRICHTEXT_SETSTYLE_OPTIMIZE, wxRICHTEXT_SETSTYLE_PARAGRAPHS_ONLY.
2345 // see richtextbuffer.h for more details.
2346 bool wxRichTextCtrl::SetStyleEx(long start, long end, const wxTextAttrEx& style, int flags)
2347 {
2348     return GetBuffer().SetStyle(wxRichTextRange(start, end-1), style, flags);
2349 }
2350
2351 bool wxRichTextCtrl::SetStyleEx(const wxRichTextRange& range, const wxTextAttrEx& style, int flags)
2352 {
2353     return GetBuffer().SetStyle(range.ToInternal(), style, flags);
2354 }
2355
2356 bool wxRichTextCtrl::SetStyleEx(const wxRichTextRange& range, const wxRichTextAttr& style, int flags)
2357 {
2358     return GetBuffer().SetStyle(range.ToInternal(), style, flags);
2359 }
2360
2361 bool wxRichTextCtrl::SetDefaultStyle(const wxTextAttrEx& style)
2362 {
2363     return GetBuffer().SetDefaultStyle(style);
2364 }
2365
2366 bool wxRichTextCtrl::SetDefaultStyle(const wxTextAttr& style)
2367 {
2368     return GetBuffer().SetDefaultStyle(wxTextAttrEx(style));
2369 }
2370
2371 const wxTextAttrEx& wxRichTextCtrl::GetDefaultStyleEx() const
2372 {
2373     return GetBuffer().GetDefaultStyle();
2374 }
2375
2376 const wxTextAttr& wxRichTextCtrl::GetDefaultStyle() const
2377 {
2378     return GetBuffer().GetDefaultStyle();
2379 }
2380
2381 bool wxRichTextCtrl::GetStyle(long position, wxTextAttr& style)
2382 {
2383     wxTextAttrEx attr(style);
2384     if (GetBuffer().GetStyle(position, attr))
2385     {
2386         style = attr;
2387         return true;
2388     }
2389     else
2390         return false;
2391 }
2392
2393 bool wxRichTextCtrl::GetStyle(long position, wxTextAttrEx& style)
2394 {
2395     return GetBuffer().GetStyle(position, style);
2396 }
2397
2398 bool wxRichTextCtrl::GetStyle(long position, wxRichTextAttr& style)
2399 {
2400     return GetBuffer().GetStyle(position, style);
2401 }
2402
2403 /// Get the content (uncombined) attributes for this position.
2404
2405 bool wxRichTextCtrl::GetUncombinedStyle(long position, wxTextAttr& style)
2406 {
2407     wxTextAttrEx attr(style);
2408     if (GetBuffer().GetUncombinedStyle(position, attr))
2409     {
2410         style = attr;
2411         return true;
2412     }
2413     else
2414         return false;
2415 }
2416
2417 bool wxRichTextCtrl::GetUncombinedStyle(long position, wxTextAttrEx& style)
2418 {
2419     return GetBuffer().GetUncombinedStyle(position, style);
2420 }
2421
2422 bool wxRichTextCtrl::GetUncombinedStyle(long position, wxRichTextAttr& style)
2423 {
2424     return GetBuffer().GetUncombinedStyle(position, style);
2425 }
2426
2427 /// Set font, and also the buffer attributes
2428 bool wxRichTextCtrl::SetFont(const wxFont& font)
2429 {
2430     wxControl::SetFont(font);
2431
2432     wxTextAttrEx attr = GetBuffer().GetAttributes();
2433     attr.SetFont(font);
2434     GetBuffer().SetBasicStyle(attr);
2435
2436     GetBuffer().Invalidate(wxRICHTEXT_ALL);
2437     Refresh(false);
2438
2439     return true;
2440 }
2441
2442 /// Transform logical to physical
2443 wxPoint wxRichTextCtrl::GetPhysicalPoint(const wxPoint& ptLogical) const
2444 {
2445     wxPoint pt;
2446     CalcScrolledPosition(ptLogical.x, ptLogical.y, & pt.x, & pt.y);
2447
2448     return pt;
2449 }
2450
2451 /// Transform physical to logical
2452 wxPoint wxRichTextCtrl::GetLogicalPoint(const wxPoint& ptPhysical) const
2453 {
2454     wxPoint pt;
2455     CalcUnscrolledPosition(ptPhysical.x, ptPhysical.y, & pt.x, & pt.y);
2456
2457     return pt;
2458 }
2459
2460 /// Position the caret
2461 void wxRichTextCtrl::PositionCaret()
2462 {
2463     if (!GetCaret())
2464         return;
2465
2466     //wxLogDebug(wxT("PositionCaret"));
2467
2468     wxRect caretRect;
2469     if (GetCaretPositionForIndex(GetCaretPosition(), caretRect))
2470     {
2471         wxPoint originalPt = caretRect.GetPosition();
2472         wxPoint pt = GetPhysicalPoint(originalPt);
2473         if (GetCaret()->GetPosition() != pt)
2474         {
2475             GetCaret()->Move(pt);
2476             GetCaret()->SetSize(caretRect.GetSize());
2477         }
2478     }
2479 }
2480
2481 /// Get the caret height and position for the given character position
2482 bool wxRichTextCtrl::GetCaretPositionForIndex(long position, wxRect& rect)
2483 {
2484     wxClientDC dc(this);
2485     dc.SetFont(GetFont());
2486
2487     PrepareDC(dc);
2488
2489     wxPoint pt;
2490     int height = 0;
2491
2492     if (GetBuffer().FindPosition(dc, position, pt, & height, m_caretAtLineStart))
2493     {
2494         rect = wxRect(pt, wxSize(wxRICHTEXT_DEFAULT_CARET_WIDTH, height));
2495         return true;
2496     }
2497
2498     return false;
2499 }
2500
2501 /// Gets the line for the visible caret position. If the caret is
2502 /// shown at the very end of the line, it means the next character is actually
2503 /// on the following line. So let's get the line we're expecting to find
2504 /// if this is the case.
2505 wxRichTextLine* wxRichTextCtrl::GetVisibleLineForCaretPosition(long caretPosition) const
2506 {
2507     wxRichTextLine* line = GetBuffer().GetLineAtPosition(caretPosition, true);
2508     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(caretPosition, true);
2509     if (line)
2510     {
2511         wxRichTextRange lineRange = line->GetAbsoluteRange();
2512         if (caretPosition == lineRange.GetStart()-1 &&
2513             (para->GetRange().GetStart() != lineRange.GetStart()))
2514         {
2515             if (!m_caretAtLineStart)
2516                 line = GetBuffer().GetLineAtPosition(caretPosition-1, true);
2517         }
2518     }
2519     return line;
2520 }
2521
2522
2523 /// Move the caret to the given character position
2524 bool wxRichTextCtrl::MoveCaret(long pos, bool showAtLineStart)
2525 {
2526     if (GetBuffer().GetDirty())
2527         LayoutContent();
2528
2529     if (pos <= GetBuffer().GetRange().GetEnd())
2530     {
2531         SetCaretPosition(pos, showAtLineStart);
2532
2533         PositionCaret();
2534
2535         return true;
2536     }
2537     else
2538         return false;
2539 }
2540
2541 /// Layout the buffer: which we must do before certain operations, such as
2542 /// setting the caret position.
2543 bool wxRichTextCtrl::LayoutContent(bool onlyVisibleRect)
2544 {
2545     if (GetBuffer().GetDirty() || onlyVisibleRect)
2546     {
2547         wxRect availableSpace(GetClientSize());
2548         if (availableSpace.width == 0)
2549             availableSpace.width = 10;
2550         if (availableSpace.height == 0)
2551             availableSpace.height = 10;
2552
2553         int flags = wxRICHTEXT_FIXED_WIDTH|wxRICHTEXT_VARIABLE_HEIGHT;
2554         if (onlyVisibleRect)
2555         {
2556             flags |= wxRICHTEXT_LAYOUT_SPECIFIED_RECT;
2557             availableSpace.SetPosition(GetLogicalPoint(wxPoint(0, 0)));
2558         }
2559
2560         wxClientDC dc(this);
2561         dc.SetFont(GetFont());
2562
2563         PrepareDC(dc);
2564
2565         GetBuffer().Defragment();
2566         GetBuffer().UpdateRanges();     // If items were deleted, ranges need recalculation
2567         GetBuffer().Layout(dc, availableSpace, flags);
2568         GetBuffer().SetDirty(false);
2569
2570         if (!IsFrozen())
2571             SetupScrollbars();
2572     }
2573
2574     return true;
2575 }
2576
2577 /// Is all of the selection bold?
2578 bool wxRichTextCtrl::IsSelectionBold()
2579 {
2580     if (HasSelection())
2581     {
2582         wxRichTextAttr attr;
2583         wxRichTextRange range = GetInternalSelectionRange();
2584         attr.SetFlags(wxTEXT_ATTR_FONT_WEIGHT);
2585         attr.SetFontWeight(wxBOLD);
2586
2587         return HasCharacterAttributes(range, attr);
2588     }
2589     else
2590     {
2591         // If no selection, then we need to combine current style with default style
2592         // to see what the effect would be if we started typing.
2593         wxRichTextAttr attr;
2594         attr.SetFlags(wxTEXT_ATTR_FONT_WEIGHT);
2595
2596         long pos = GetAdjustedCaretPosition(GetCaretPosition());
2597         if (GetStyle(pos, attr))
2598         {
2599             if (IsDefaultStyleShowing())
2600                 wxRichTextApplyStyle(attr, GetDefaultStyleEx());
2601             return attr.GetFontWeight() == wxBOLD;
2602         }
2603     }
2604     return false;
2605 }
2606
2607 /// Is all of the selection italics?
2608 bool wxRichTextCtrl::IsSelectionItalics()
2609 {
2610     if (HasSelection())
2611     {
2612         wxRichTextRange range = GetInternalSelectionRange();
2613         wxRichTextAttr attr;
2614         attr.SetFlags(wxTEXT_ATTR_FONT_ITALIC);
2615         attr.SetFontStyle(wxITALIC);
2616
2617         return HasCharacterAttributes(range, attr);
2618     }
2619     else
2620     {
2621         // If no selection, then we need to combine current style with default style
2622         // to see what the effect would be if we started typing.
2623         wxRichTextAttr attr;
2624         attr.SetFlags(wxTEXT_ATTR_FONT_ITALIC);
2625
2626         long pos = GetAdjustedCaretPosition(GetCaretPosition());
2627         if (GetStyle(pos, attr))
2628         {
2629             if (IsDefaultStyleShowing())
2630                 wxRichTextApplyStyle(attr, GetDefaultStyleEx());
2631             return attr.GetFontStyle() == wxITALIC;
2632         }
2633     }
2634     return false;
2635 }
2636
2637 /// Is all of the selection underlined?
2638 bool wxRichTextCtrl::IsSelectionUnderlined()
2639 {
2640     if (HasSelection())
2641     {
2642         wxRichTextRange range = GetInternalSelectionRange();
2643         wxRichTextAttr attr;
2644         attr.SetFlags(wxTEXT_ATTR_FONT_UNDERLINE);
2645         attr.SetFontUnderlined(true);
2646
2647         return HasCharacterAttributes(range, attr);
2648     }
2649     else
2650     {
2651         // If no selection, then we need to combine current style with default style
2652         // to see what the effect would be if we started typing.
2653         wxRichTextAttr attr;
2654         attr.SetFlags(wxTEXT_ATTR_FONT_UNDERLINE);
2655         long pos = GetAdjustedCaretPosition(GetCaretPosition());
2656
2657         if (GetStyle(pos, attr))
2658         {
2659             if (IsDefaultStyleShowing())
2660                 wxRichTextApplyStyle(attr, GetDefaultStyleEx());
2661             return attr.GetFontUnderlined();
2662         }
2663     }
2664     return false;
2665 }
2666
2667 /// Apply bold to the selection
2668 bool wxRichTextCtrl::ApplyBoldToSelection()
2669 {
2670     wxRichTextAttr attr;
2671     attr.SetFlags(wxTEXT_ATTR_FONT_WEIGHT);
2672     attr.SetFontWeight(IsSelectionBold() ? wxNORMAL : wxBOLD);
2673
2674     if (HasSelection())
2675         return SetStyleEx(GetSelectionRange(), attr, wxRICHTEXT_SETSTYLE_WITH_UNDO|wxRICHTEXT_SETSTYLE_OPTIMIZE|wxRICHTEXT_SETSTYLE_CHARACTERS_ONLY);
2676     else
2677         SetAndShowDefaultStyle(attr);
2678     return true;
2679 }
2680
2681 /// Apply italic to the selection
2682 bool wxRichTextCtrl::ApplyItalicToSelection()
2683 {
2684     wxRichTextAttr attr;
2685     attr.SetFlags(wxTEXT_ATTR_FONT_ITALIC);
2686     attr.SetFontStyle(IsSelectionItalics() ? wxNORMAL : wxITALIC);
2687
2688     if (HasSelection())
2689         return SetStyleEx(GetSelectionRange(), attr, wxRICHTEXT_SETSTYLE_WITH_UNDO|wxRICHTEXT_SETSTYLE_OPTIMIZE|wxRICHTEXT_SETSTYLE_CHARACTERS_ONLY);
2690     else
2691         SetAndShowDefaultStyle(attr);
2692     return true;
2693 }
2694
2695 /// Apply underline to the selection
2696 bool wxRichTextCtrl::ApplyUnderlineToSelection()
2697 {
2698     wxRichTextAttr attr;
2699     attr.SetFlags(wxTEXT_ATTR_FONT_UNDERLINE);
2700     attr.SetFontUnderlined(!IsSelectionUnderlined());
2701
2702     if (HasSelection())
2703         return SetStyleEx(GetSelectionRange(), attr, wxRICHTEXT_SETSTYLE_WITH_UNDO|wxRICHTEXT_SETSTYLE_OPTIMIZE|wxRICHTEXT_SETSTYLE_CHARACTERS_ONLY);
2704     else
2705         SetAndShowDefaultStyle(attr);
2706     return true;
2707 }
2708
2709 /// Is all of the selection aligned according to the specified flag?
2710 bool wxRichTextCtrl::IsSelectionAligned(wxTextAttrAlignment alignment)
2711 {
2712     wxRichTextRange range;
2713     if (HasSelection())
2714         range = GetInternalSelectionRange();
2715     else
2716         range = wxRichTextRange(GetCaretPosition()+1, GetCaretPosition()+1);
2717
2718     wxRichTextAttr attr;
2719     attr.SetAlignment(alignment);
2720
2721     return HasParagraphAttributes(range, attr);
2722 }
2723
2724 /// Apply alignment to the selection
2725 bool wxRichTextCtrl::ApplyAlignmentToSelection(wxTextAttrAlignment alignment)
2726 {
2727     wxRichTextAttr attr;
2728     attr.SetAlignment(alignment);
2729     if (HasSelection())
2730         return SetStyle(GetSelectionRange(), attr);
2731     else
2732     {
2733         wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(GetCaretPosition()+1);
2734         if (para)
2735             return SetStyleEx(para->GetRange().FromInternal(), attr, wxRICHTEXT_SETSTYLE_WITH_UNDO|wxRICHTEXT_SETSTYLE_OPTIMIZE|wxRICHTEXT_SETSTYLE_PARAGRAPHS_ONLY);
2736     }
2737     return true;
2738 }
2739
2740 /// Apply a named style to the selection
2741 void wxRichTextCtrl::ApplyStyle(wxRichTextStyleDefinition* def)
2742 {
2743     // Flags are defined within each definition, so only certain
2744     // attributes are applied.
2745     wxRichTextAttr attr(def->GetStyle());
2746
2747     int flags = wxRICHTEXT_SETSTYLE_WITH_UNDO|wxRICHTEXT_SETSTYLE_OPTIMIZE;
2748
2749     // Make sure the attr has the style name
2750     if (def->IsKindOf(CLASSINFO(wxRichTextParagraphStyleDefinition)))
2751     {
2752         attr.SetParagraphStyleName(def->GetName());
2753
2754         // If applying a paragraph style, we only want the paragraph nodes to adopt these
2755         // attributes, and not the leaf nodes. This will allow the context (e.g. text)
2756         // to change its style independently.
2757         flags |= wxRICHTEXT_SETSTYLE_PARAGRAPHS_ONLY;
2758     }
2759     else
2760         attr.SetCharacterStyleName(def->GetName());
2761
2762     if (HasSelection())
2763         SetStyleEx(GetSelectionRange(), attr, flags);
2764     else
2765         SetAndShowDefaultStyle(attr);
2766 }
2767
2768 /// Apply the style sheet to the buffer, for example if the styles have changed.
2769 bool wxRichTextCtrl::ApplyStyleSheet(wxRichTextStyleSheet* styleSheet)
2770 {
2771     if (!styleSheet)
2772         styleSheet = GetBuffer().GetStyleSheet();
2773     if (!styleSheet)
2774         return false;
2775
2776     if (GetBuffer().ApplyStyleSheet(styleSheet))
2777     {
2778         GetBuffer().Invalidate(wxRICHTEXT_ALL);
2779         Refresh(false);
2780         return true;
2781     }
2782     else
2783         return false;
2784 }
2785
2786 /// Sets the default style to the style under the cursor
2787 bool wxRichTextCtrl::SetDefaultStyleToCursorStyle()
2788 {
2789     wxTextAttrEx attr;
2790     attr.SetFlags(wxTEXT_ATTR_CHARACTER);
2791
2792     // If at the start of a paragraph, use the next position.
2793     long pos = GetAdjustedCaretPosition(GetCaretPosition());
2794
2795 #if wxRICHTEXT_USE_DYNAMIC_STYLES
2796     if (GetUncombinedStyle(pos, attr))
2797 #else
2798     if (GetStyle(pos, attr))
2799 #endif
2800     {
2801         SetDefaultStyle(attr);
2802         return true;
2803     }
2804
2805     return false;
2806 }
2807
2808 /// Returns the first visible position in the current view
2809 long wxRichTextCtrl::GetFirstVisiblePosition() const
2810 {
2811     wxRichTextLine* line = GetBuffer().GetLineAtYPosition(GetLogicalPoint(wxPoint(0, 0)).y);
2812     if (line)
2813         return line->GetAbsoluteRange().GetStart();
2814     else
2815         return 0;
2816 }
2817
2818 /// The adjusted caret position is the character position adjusted to take
2819 /// into account whether we're at the start of a paragraph, in which case
2820 /// style information should be taken from the next position, not current one.
2821 long wxRichTextCtrl::GetAdjustedCaretPosition(long caretPos) const
2822 {
2823     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(caretPos+1);
2824
2825     if (para && (caretPos+1 == para->GetRange().GetStart()))
2826         caretPos ++;
2827     return caretPos;
2828 }
2829
2830 /// Get/set the selection range in character positions. -1, -1 means no selection.
2831 /// The range is in API convention, i.e. a single character selection is denoted
2832 /// by (n, n+1)
2833 wxRichTextRange wxRichTextCtrl::GetSelectionRange() const
2834 {
2835     wxRichTextRange range = GetInternalSelectionRange();
2836     if (range != wxRichTextRange(-2,-2) && range != wxRichTextRange(-1,-1))
2837         range.SetEnd(range.GetEnd() + 1);
2838     return range;
2839 }
2840
2841 void wxRichTextCtrl::SetSelectionRange(const wxRichTextRange& range)
2842 {
2843     wxRichTextRange range1(range);
2844     if (range1 != wxRichTextRange(-2,-2) && range1 != wxRichTextRange(-1,-1) )
2845         range1.SetEnd(range1.GetEnd() - 1);
2846
2847     wxASSERT( range1.GetStart() > range1.GetEnd() );
2848
2849     SetInternalSelectionRange(range1);
2850 }
2851
2852 #endif
2853     // wxUSE_RICHTEXT
2854